In-situ constructing visible light CdS/Cd-MOF photocatalyst with enhanced photodegradation of methylene blue |
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| Institution: | 1. College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China;2. School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China;3. Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450001, China;4. Department of Mechanical & Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India;5. Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA;6. Taiyuan University of Science and Technology, Taiyuan 030024, China;1. Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA;2. National Energy Technology Laboratory, Pittsburgh, PA 15236, USA;3. Leidos Research Support Team, Pittsburgh, PA 15236-0940, USA;1. Laboratory of Separation and Reaction Engineering (LSRE), Associate Laboratory (LSRE/LCM), Department of Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, S/N, 4099-002 Porto, Portugal;2. Department of Advanced Calculations, Chemical, Petroleum, and Polymer Engineering Research Center, Shiraz Branch, Islamic Azad University, Shiraz, Iran;3. Department of Chemical Engineering, Ilam University, Ilam 69315-516, Iran;4. Department of Chemical Engineering, University of the Basque Country UPV/EHU, P.O. Box 644, E48080 Bilbao, Spain;5. Department of Petroleum Engineering, Omidiyeh Branch, Islamic Azad University, Omidiyeh, Iran;1. School of Environment and Safety Engineering, Institute of Advanced Energy Materials and Systems, North University of China, Taiyuan 030051, China;2. School of Traffic & Environment, Shenzhen Institute of Information Technology, Shenzhen 518172, China;3. School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China;4. Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450001, China;5. Integrated Composites Laboratory (ICL), Department of Chemical and Bimolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA;6. Department of Chemistry and Physics, University of Arkansas, Pine Bluff, AR 71601, USA;1. Department of Chemistry, Sharif University of Technology, Tehran, 11365-11155, Iran;2. Semiconductors Department, Materials and Energy Research Center, Tehran, 14155-4777, Iran;1. School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Zigong, PR China;2. Department of Pharmacy, School of Medicine, Xi’an International University, Xi’an 710077, Shaanxi, China;3. Department of Chemistry, Faculty of Science, University of Lucknow, Lucknow 226 007, India;4. Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia |
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| Abstract: | Based on high specific surface area, high porosity of metal-organic frameworks (MOFs) and excellent visible light response of CdS, the CdS/Cd-MOF nanocomposites were constructed by in-situ sulfurization to form CdS using Cd-MOF as precursor and the CdS loading was controlled by the dose of thioacetamide. Under the irradiation of simulated sunlight, the degradation rate of methylene blue (MB) by 10 mg MOF/CdS-6 (mass ratio of MOF to thioacetamide is 6:1) was 91.9% in 100 min, which was higher than that of pure Cd-MOF (62.3%) and pure CdS (67.5%). This is attributed to the larger specific surface area of the composite catalysts, which provides more active sites. Meanwhile, the loading of CdS obviously broadens the light response range of Cd-MOF and improves the utilization of visible light. The Mott-Schottky model experiment shows that the formed type-II heterojunction between Cd-MOF and CdS can effectively inhibit the recombination of photogenerated electrons and holes. Meanwhile, the photocurrent intensity of MOF/CdS-6 is 8 times and 2.5 times of that of pure Cd-MOF and CdS. In addition, MOF/CdS-6 showed good photocatalytic performance after five cycles, showing excellent stability and reusability. |
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| Keywords: | MOF CdS Photocatalytic activity Visible light Heterojunction Dye |
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